Forum: GpuOwl
2022-05-12, 11:11
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Replies: 2,760
Views: 366,830
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Forum: GpuOwl
2022-05-12, 11:01
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Replies: 34
Views: 2,119
If using gpuowl 7.x, also try with
-use...
If using gpuowl 7.x, also try with
-use TRIG_COMPUTE=0
or 1, or 2 (2 being the default).
The idea being that 2 does more compute, 0 does more memory accesses, and 1 is intermediary between those...
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Forum: Information & Answers
2022-05-10, 15:49
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Replies: 8
Views: 634
Never delete anything. Create a "temporary"...
Never delete anything. Create a "temporary" directory somewhere, and just *move* what you want to delete there.
Later on, you can always move it back if the mood changes.
When everything is...
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Forum: GPU Computing
2022-04-10, 17:22
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Replies: 374
Views: 95,312
It was in December 2020.
I imagine it must...
It was in December 2020.
I imagine it must have been painful to lose so many R7s, sorry for that. Indeed a pity they're not made anymore, in retrospective I should've bought a few more just for my...
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Forum: GPU Computing
2022-04-10, 08:21
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Replies: 374
Views: 95,312
I had one R7 GPU die on me following something...
I had one R7 GPU die on me following something PSU related, not sure exactly what happened there. But the symptoms were similar, the lights/fans were ON but the GPU was not detected. I looked in the...
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Forum: GpuOwl
2022-03-27, 06:16
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Replies: 2,760
Views: 366,830
But maybe something should be done to fix the...
But maybe something should be done to fix the root of the problem, which is IMO that the proof file was not saved, but the checkpoint was advanced.
Edit: I see now what the code does. If it can't...
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Forum: GpuOwl
2022-03-27, 05:59
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Replies: 2,760
Views: 366,830
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Forum: GpuOwl
2021-11-19, 14:49
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Replies: 5
Views: 779
I don't understand what happened. The proof...
I don't understand what happened. The proof residues are written once only, afterwards they are only read. The check of residues at startup is done CPU-side only (it's a very simple checksum over the...
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Forum: Software
2021-11-04, 09:26
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Replies: 10
Views: 1,584
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Forum: Software
2021-09-24, 08:31
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Replies: 7
Views: 1,361
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Forum: Lounge
2021-09-06, 19:12
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Replies: 1,928
Views: 218,414
Ivan Patzaichin
Ivan Patzaichin was a legendary Romanian canoeist: https://en.wikipedia.org/wiki/Ivan_Patzaichin
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Forum: Math
2021-07-06, 17:27
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Replies: 24
Views: 3,852
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Forum: mersenne.ca
2021-06-14, 19:20
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Replies: 16
Views: 2,275
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Forum: mersenne.ca
2021-06-14, 06:03
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Replies: 16
Views: 2,275
Let's consider a story: on a dangerous trip,...
Let's consider a story: on a dangerous trip, somebody must first cross a lake, and afterwards the forest. In the lake there's an aligator that would eat him with 90% chances. In the unlikely event...
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Forum: Software
2021-06-02, 13:58
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Replies: 54
Views: 12,645
There's one more interesting factoid about the...
There's one more interesting factoid about the difference between "classic" FFT and NTT:
when working with complex numbers in the classic FFT, the inverse transform is equal to the conjugate of...
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Forum: Software
2021-06-02, 13:33
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Replies: 54
Views: 12,645
In the same setup (FFT 4M, Radeon VII, exponent...
In the same setup (FFT 4M, Radeon VII, exponent around 107M) I gained about 33% performance by tweaking (with inline assembly) the low-level modular primitives (add, sub, mul). So now the performance...
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Forum: Software
2021-05-27, 07:03
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Replies: 54
Views: 12,645
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Forum: Software
2021-05-26, 20:33
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Replies: 54
Views: 12,645
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Forum: Software
2021-05-25, 06:50
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Replies: 54
Views: 12,645
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Forum: Software
2021-05-25, 06:41
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Replies: 54
Views: 12,645
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Forum: Software
2021-05-25, 00:49
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Replies: 54
Views: 12,645
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Forum: Math
2021-05-17, 12:17
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Replies: 2
Views: 1,115
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Forum: GpuOwl
2021-05-13, 17:54
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Replies: 4
Views: 969
It's fine to run without a config.txt if you...
It's fine to run without a config.txt if you don't need it. It's just a facility to put the flags that you would otherwise pass on the command line, in a file. The format is exactly what you'd put on...
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Forum: Hardware
2021-04-29, 10:05
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Replies: 77
Views: 13,513
TF (trial factoring) does not use FFTs.
For...
TF (trial factoring) does not use FFTs.
For primality testing Mersenne numbers, there is LL and PRP; the two are very similar from an implementation perspective. They both require squaring very...
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Forum: Software
2021-04-27, 11:20
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Replies: 54
Views: 12,645
The cost of small multiplication
(sorry for the below being so trivial)
At the core of a FFT there are "small multiplications", word-size or some small multiple of word-size, and I've been thinking a bit about their cost.
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